Plug gauge



Jan. 8, 1946.

C. W. EISELE PLUG GAUGE Filed May 17, 1943 I Inventor Cizlesz'er WEZLSeZe y Zrwwaa? Patented Jan. 8, 1946' UNITED STATES PATENT OFFICEPLUG GAUGE Chester W. Eisele, Harvey, Ill.

Application May 17, 1943, Serial No. 487,319

, of the key bearing against the two rods and the 23 Claims.

The present invention relates to double ended plug gauges of the go and"not go type whereby the operator may conveniently first try the gogauging end of the tool and then the "not go end, if necessary, todetermine accurately when the opening in the work is of a predetermineddimension.

An important object of the present invention is to provide means foreffectively locking the go gauge rod in position in the handle of thetool in a manner to easily and quickly remove and replace the rod whenthe same becomes worn.

A further object is to provide a tool of this character of simple andpractical construction, .which is eflicient and reliable in use,relatively inexpensive to manufacture and otherwise well adapted for thepurposes for which the same is intended.

Other objects and advantages reside in the details of construction andoperation as more fully hereinafter described and claimed, referencebeing had to the accompanying drawing forming part hereof, wherein likereference numerals refer to like parts throughout, and in which:

Figure 1 is a side elevational view.

Figure 2 is a longitudinal sectional view.

Figure 3 is an end elevational view of the go" end of the gauge.

Figure 4 is a similar view of the not go end, and

Figure 5 is a transverse sectional view taken on a line 55 of Figure 1.

Referring now to the drawing in detail, the numeral 5 designates ahollow cylindrical barrel or handle of transparent material havingtubular metallic extensions 6 threaded in each end ,of the handle.

A pair of cylindrical gauge rods 8 are closely fitted in the outer endof one extension of a proper diameter to form the go gauge rods, theinner ends of the rods having kerfs 9 for rotating the rods by a screwdriver. I

A locking key Ill of semi-cylindrical form is also inserted in theextension, the rounded side flat side ll of the key engaged by a setscrew l2 threaded through the wall of the extension. The outer end ofthe key is uniformly shaped in its cylindrical form to provide a fingergripping head l3.

The other extension is also provided with a pair of not go gauge rods l4also formed with a kerf I 5 at their inner ends and secured in positionby a semi-cylindrical locking key l6 held in position by a set screwl'l.

vA label I8 is placed in the handle having the desired data printedthereon to indicate the number and size of the gauge.

When the work contacting surfaces of the gauge rods become worn theplugs may be rotated by means of a screw driver to bring new faces intoposition for use.

The locking key l3 may also be used as a depth gauge and the provisionof the double plug ends afiords many advantages, such as the checking ofround hole conditions, the elimination of air vents for dead end holes,and permits a reversal of the plug members to prolong the life thereof.

It is believed the details f construction, operation and manner of useof the device will be readily understood from the foregoing withoutfurther detailed explanation.

Having described the invention, what is claimed as new is: i

1. A plug gauge comprising a tubular holder, 9. pair of cylindricalgauge rods positioned longitudinally in contacting parallel relation inthe holder, means on the inner ends of the rods for rotatably adjustingthe rods, and means for looking the rods against longitudinal movementin the holder.

2. A plug gauge comprising a tubular holder, a pair of cylindrical gaugerods positioned longitudinally in contacting parallel relation in theholder, and semi-cylindrical locking keys removably inserted in wedgingcontact between the pair of rods and the holder.

CHESTER W. EISELE.

